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LM185-1.2QML 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 LM185-1.2QML
상세설명  LM185-1.2QML Micropower Voltage Reference Diode
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LM185-1.2QML 데이터시트(HTML) 9 Page - Texas Instruments

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Typical Applications (Continued)
METER THERMOMETERS
0˚C−100˚C Thermometer
20156128
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1µA/˚K
2. Remove short, adjust R2 for correct reading in centigrade
†IQ at 1.3V.500µA
IQ at 1.6V.2.4mA
Lower Power Thermometer
20156129
*2N3638 or 2N2907 select for inverse HFE . 5
†Select for operation at 1.3V
‡IQ . 600µA to 900µA
0˚F−50˚F Thermometer
20156130
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8µA/˚K
2. Remove short, adjust R2 for correct reading in ˚F
Centigrade Thermometer
20156101
Calibration
1. Adjust R1 so that V1 = temp at 1mV/˚K
2. Adjust V2 to 273.2mV
†IQ for 1.3V to 1.6V battery volt-
age = 50µA to 150µA
Micropower Thermocouple Cold Junction
Compensator
20156131
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Seebeck
R1 R2
Voltage
Voltage
Type
Coefficient (
Ω)(Ω) Across
R1
Across
R2
(µV/˚C)
@ 25˚C
(mV)
(mV)
J
52.3
5231.24k
15.60
14.32
T
42.8
432 1k
12.77
11.78
K
40.8
412953
12.17
11.17
S
6.4
63.4150
1.908
1.766
Typical supply current 50µA
www.national.com
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